I am very new at this, I have 34 stepper motors and on the Y & A axis I get stalling /growling when in the jog mode and also when trying to run the demo in mach 3. Mostly when I stop and start. I have check settings, wiring, looks right. My x and z seems to do find. I have changed settings in motor tuning and I have to go back to my original setting. Can anyone help?